WO2010151068A2 - 적응형 순환 지연 다이버서티를 이용한 주파수 감쇄 보상 방법 및 그를 이용한 송신장치와 방법, 수신장치와 방법 - Google Patents

적응형 순환 지연 다이버서티를 이용한 주파수 감쇄 보상 방법 및 그를 이용한 송신장치와 방법, 수신장치와 방법 Download PDF

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Publication number
WO2010151068A2
WO2010151068A2 PCT/KR2010/004123 KR2010004123W WO2010151068A2 WO 2010151068 A2 WO2010151068 A2 WO 2010151068A2 KR 2010004123 W KR2010004123 W KR 2010004123W WO 2010151068 A2 WO2010151068 A2 WO 2010151068A2
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Prior art keywords
antenna
frequency band
cyclic delay
specific frequency
delay value
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PCT/KR2010/004123
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English (en)
French (fr)
Korean (ko)
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WO2010151068A9 (ko
WO2010151068A3 (ko
Inventor
서성진
박경민
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(주)팬택
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Priority to JP2012517389A priority Critical patent/JP2012531801A/ja
Priority to US13/380,451 priority patent/US20120093258A1/en
Priority to EP10792350A priority patent/EP2448141A2/en
Priority to CN2010800360774A priority patent/CN102484516A/zh
Publication of WO2010151068A2 publication Critical patent/WO2010151068A2/ko
Publication of WO2010151068A3 publication Critical patent/WO2010151068A3/ko
Publication of WO2010151068A9 publication Critical patent/WO2010151068A9/ko

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0623—Auxiliary parameters, e.g. power control [PCB] or not acknowledged commands [NACK], used as feedback information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0667—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal
    • H04B7/0671—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal using different delays between antennas

Definitions

  • the present invention relates to a frequency attenuation compensation method using adaptive cyclic delay diversity, and a transmitter / method and a receiver / method using the same.
  • the receiving end feedback-transmits the delayed antenna information and the adaptive cyclic delay value to the antenna at the receiving end, and at the transmitting end, the delayed antenna delays the signal by the adaptive cyclic delay value to receive in a specific frequency band. It is to improve the frequency response characteristics.
  • MIMO multi-input multi-output
  • CDD Cyclic Delay Diversity
  • CDD is a diversity technique used in an OFDM-based wireless communication system, and converts spatial diversity into frequency diversity to avoid intersymbol interference.
  • the signal of each antenna is delayed by a cyclic delay value and transmitted.
  • Increasing may increase the coding gain through the channel coding technique.
  • the first antenna transmits the original signal as it is, and from the second antenna to the Nth antenna, a cyclic delay is determined using a predetermined delay value.
  • a cyclic delay is determined using a predetermined delay value.
  • the overall frequency selectivity of the channel can be improved to obtain the processing gain due to channel coding.
  • this does not improve the channel frequency response of a specific band but increases the processing gain of channel coding across the channel. I can only.
  • An object of the present invention for solving the above problems is to provide an apparatus and method for compensating for frequency attenuation of a specific frequency band in a multiple transmit antenna system.
  • Another object of the present invention is to use the channel information to set the cyclic delay value of the appropriate size to give the frequency selectivity to the overall channel to improve the frequency response characteristics as well as deep frequency attenuation occurring in a specific frequency band It is to provide an apparatus and method that can compensate for the phenomenon.
  • Another object of the present invention is to provide an apparatus and method for compensating for frequency attenuation in a specific frequency band by calculating an adaptive cyclic delay value at a receiving side and feeding it back to a transmitting side in a multiple transmit antenna system.
  • Another object of the present invention is to select an antenna to apply a cyclic delay on the receiving side based on the phase difference of the transmission signal of the multiple transmitting antenna, calculate the optimized adaptive cyclic delay value and provide it to the transmitting side, the transmitting side based on that
  • the present invention provides an apparatus and method for compensating for frequency attenuation in a desired frequency band by performing a cyclic delay transmission.
  • an embodiment of the present invention is a receiver for receiving a signal transmitted from multiple antennas of a transmitter and including a feedback information processor for compensating for frequency attenuation in a specific band.
  • the information processor includes a first section for estimating a reference signal transmitted from each antenna to calculate a phase difference between signals, a second section for searching for a specific frequency band capable of compensating for frequency attenuation through phase difference correction, and the specific frequency.
  • a fifth section for generating a feedback signal including an adaptive cyclic delay value and information on delayed antennas and transmitting the feedback signal to the transmitter; Provides a receiving apparatus characterized in that it also.
  • a multi-antenna and a transmitting apparatus including a cyclic delay control unit for controlling all or part of each antenna constituting the multi-antenna to transmit a cyclically delayed signal to a receiving apparatus, wherein the cyclic delay control unit receives Adaptive Cyclic Delay calculated by the receiver and delayed antenna information selected by the receiver based on a phase difference between each antenna signal received by the apparatus, specific frequency band information capable of compensating for frequency attenuation, and selected by the receiver. And transmit the signal delayed by the adaptive cyclic delay value to the delay target antenna.
  • a frequency attenuation compensation method for a specific frequency band using a multiplex transmission antenna system including a reception device and a transmission device having multiple transmission antennas, the reception device comprising: a reference signal transmitted from each antenna
  • a phase difference calculating step of calculating a phase difference between signals by estimating a, a specific frequency band searching step of searching for a specific frequency band capable of compensating for frequency attenuation through phase difference correction, and a frequency attenuation of the specific frequency band can be compensated for
  • a delay target antenna selection step of selecting a delay target antenna, an adaptive cyclic delay value calculation step of calculating an adaptive cyclic delay value using the searched specific frequency band and the estimated reference signal, and the calculated Adaptive cyclic delay value and delayed target antenna information is transmitted to the transmitter. It provides a transfer step and a method for compensating frequency attenuation from the transmitter includes receiving a signal that delayed by the adaptive cyclic delay values for the delay target antenna.
  • a frequency attenuation compensation method for a specific frequency band using a multiplex transmission antenna system including a reception device and a transmission device having multiple transmission antennas, the transmission device includes: a phase difference between each antenna signal; Feedback information receiving step of receiving from the receiving apparatus adaptive cyclic delay value (Cyclic Delay) calculated by the receiving device and delay target antenna information selected by the receiving device based on specific frequency band information capable of compensating for frequency attenuation. And a cyclic delay signal transmitting step of controlling to transmit a signal delayed by the adaptive cyclic delay value with respect to the delay target antenna by using the received adaptive cyclic delay value and the delay target antenna information.
  • a cyclic delay signal transmitting step of controlling to transmit a signal delayed by the adaptive cyclic delay value with respect to the delay target antenna by using the received adaptive cyclic delay value and the delay target antenna information.
  • the cyclic delay calculated from the phase difference information between the signals of the multiple antennas received, delay target antenna information selected therefrom, specific frequency band information requiring frequency attenuation compensation, and the specific frequency band information And transmitting a value to the transmitter, and receiving a signal delayed by the cyclic delay value from the delay target antenna of the transmitter.
  • the retardation information calculated from the phase difference information between each signal of the multiple antennas, antenna information to be selected therefrom, specific frequency band information requiring frequency attenuation compensation, and the specific frequency band information. And a step of receiving feedback from a receiver, and delaying and transmitting a signal by the delay target antenna by the cyclic delay value.
  • 1 is a configuration diagram of a 3X1 multiple transmit / receive antenna (MIMO) system using cyclic delay diversity (CDD),
  • MIMO multiple transmit / receive antenna
  • CDD cyclic delay diversity
  • FIG. 2A illustrates channel response characteristics of a MIMO system without using a CDD
  • FIG. 2B illustrates channel response characteristics when a large delay CDD is applied.
  • FIG. 3 is a block diagram of a transmitter according to an embodiment of the present invention.
  • FIG. 4 is a block diagram of a receiving apparatus according to an embodiment of the present invention.
  • FIG. 5 is a flowchart illustrating a frequency attenuation compensation method for a specific frequency band using a multiplex transmission antenna system according to an embodiment of the present invention
  • 6 to 8 illustrate changes in channel response characteristics when an embodiment of the present invention is applied to a 3 ⁇ 1 multiple antenna system.
  • FIG. 1 is a configuration diagram of a 3X1 multiple transmit / receive antenna (MIMO) system using a CDD technique
  • FIG. 2A shows a channel response characteristic of a MIMO system without using a CDD
  • FIG. 2B shows a large delay CDD (Large Delay CDD). Channel response characteristics in the case of application are shown.
  • the 3X1 CDD MIMO system includes a channel coding unit 110, a plurality of cyclic delay blocks 120, 120 ′, 120 ′′ and a plurality of antennas 130, 130 ′, 130 ′′ on the transmitting side.
  • the receiving side is composed of one antenna 140 and a channel decoding unit 150.
  • the cyclic delay block 120 for the first antenna 130 of FIG. 1 may not be required.
  • a plurality of codes are viewed in units of code blocks (CBs) of channel coding units. It can be seen that the block cannot recover information.
  • CBs code blocks
  • the dark shaded part (black) is part of which information is broken due to frequency selective fading, and the code block composed of dark shades and white part is partly broken, but information is recovered after channel coding.
  • a code block composed of dark and light shades refers to a code block that fails to recover information even after channel coding due to a lot of broken information.
  • the large delay CDD (large delay CDD) sets a large delay corresponding to tens to hundreds of sample values as a cyclic delay, and in the case of the first antenna, transmits the original signal as it is, and the second antenna. And a third antenna transmits with a cyclic delay, and when using a large delay CDD (frequency delay CDD), the frequency response characteristics are shown in FIG. 2B.
  • the overall frequency selectivity of the channel can be improved to obtain the processing gain due to channel coding, but this does not improve the channel frequency response of a specific band, but rather the processing of channel coding throughout the channel. This is somewhat limited because it can only increase the gain.
  • FIG. 3 is a block diagram of a transmitter according to an embodiment of the present invention.
  • a transmission apparatus includes a precoder 310 and an orthogonal frequency multimodulator (OFDM) 320, and the N-th antenna (Tx1 to TxN) is firstly provided after the OFDM.
  • the remaining antennas other than the antenna Tx1 are provided with cyclic delay blocks 330-1 to 330-n to which a cyclic delay value can be applied, and a cyclic delay control unit 340 for controlling all cyclic delay blocks is provided. Included.
  • the cyclic delay control unit 340 receives the delay target antenna information and the adaptive cyclic delay value (Cyclic Delay) for the antenna feedback feedback transmitted from the receiver, and then for the delay target antenna A function of controlling to transmit a signal delayed by the adaptive cyclic delay value is performed. A detailed configuration thereof will be described below with reference to FIGS. 4 to 6.
  • the precoder 310 may include an FEC encoder, an interleaver, a symbol mapper, and the like, but is not limited thereto.
  • the precoder 310 may be understood to include all components in charge of signal processing before modulation. shall.
  • the transmitting device and the receiving device preferably correspond to a base station (or Node B, eNode B, etc.) and a user terminal (UE) in downlink, respectively, but are not limited thereto.
  • the roles may be changed, and a function of selecting a specific frequency band for attenuation compensation by calculating a phase difference between signals received according to an embodiment of the present invention and calculating and transmitting an adaptive cyclic delay value is performed. All devices are referred to as “receivers”, and all devices that receive the feedback feedback signal and perform signal delay transmission according to the adaptive cyclic delay value are collectively referred to as "transmitters”.
  • FIG. 4 is a block diagram of a receiving apparatus according to an embodiment of the present invention.
  • a receiver includes one or more antennas (Rx) 410, a cyclic prefix remover (CPR) 420, an inverse OFD modulator (IOFDM) 430, and a channel.
  • Rx antennas
  • CPR cyclic prefix remover
  • IIFDM inverse OFD modulator
  • a channel estimator 440 and a feedback information processor 450 are included.
  • the channel estimator 440 estimates the channel state of each band after channel estimation through a reference signal (RS) received from an antenna. Since the channel condition changes with time, channel estimation is performed using a reference signal continuously with a certain period.
  • RS reference signal
  • the feedback information processor 450 may compensate for frequency attenuation through phase estimation and a first section for estimating a phase difference between signals by estimating a reference signal transmitted from each antenna simultaneously with channel estimation.
  • a second section for searching for a specific frequency band, a third section for selecting a delay target antenna capable of compensating for attenuation of a specific frequency band, and an adaptive cyclic delay value (Cyclic) using information of the found specific frequency band.
  • a fourth section for calculating a delay) and a fifth section for transmitting a feedback signal including the calculated adaptive cyclic delay value and delay target antenna information to a transmitting apparatus.
  • the feedback information processor may be implemented alone or integrated with other components such as a channel estimator, and may be linked with a separate transmission antenna for transmitting a feedback signal.
  • the above-described delayed antenna may be determined as one or a plurality, and the second section may select an area having a high frequency attenuation at the same time as the absolute value of the phase difference of the signal transmitted from any two antennas is greater than or equal to a certain threshold. do.
  • the specific threshold approaches ⁇ (3.14) or - ⁇ (-3.14), the compensation effect is increased.
  • the specific threshold is 0.8 ⁇ or more.
  • the specific threshold need not be limited to a specific range and frequency attenuation compensation is required. Depending on the degree of need of 6/7 ⁇ , 5/6 ⁇ , 3/4 ⁇ may be appropriately determined.
  • the criterion of the region where the frequency attenuation is severe may be, for example, a frequency attenuation occurs below -2 dB, but is not limited thereto and may be set variably according to channel characteristics to be used.
  • the fourth section of the feedback information processor determines an adaptive cyclic delay value so as to minimize a phase difference between a signal transmitted from a delay target antenna and a reference antenna in a selected specific frequency band, and specifically, an adaptive cyclic delay value.
  • ( ⁇ cyc, n ) is preferably determined by the following equation (1).
  • n is the number of the antenna to be delayed
  • k is the index of a specific frequency band
  • N FFT is the number of sub-carriers
  • ⁇ k (d) is the compensation desired phase difference value
  • m is an arbitrary integer. do.
  • the adaptive cyclic delay values ⁇ cyc and n are cyclic delay values, the values are not limited to one, but may be determined in plural numbers by the integer m as in Equation 1 above.
  • ⁇ cyc, n value is larger obtained adaptive cycle, since to compensate for the response attenuation of a specific frequency band that means as in the large delay CDD above with many poles (pole) generating a frequency response harder delay value ⁇ cyc, An appropriately small value is selected from n values, and since m is 0, it is preferable that the smallest value of the plurality of adaptive cyclic delay value candidates is determined as an adaptive cyclic delay value, but is not limited thereto.
  • Equation 1 since ⁇ cyc, n causes a phase change in the band k to be ⁇ k (d), which is a compensation desired phase difference value, ideally, ⁇ k (d) is ⁇ , which is the most significant compensable phase difference. (3.14) or - ⁇ (-3.14) is preferred, but the actual phase difference between the two antenna signals to apply the actual compensation may not be exactly ⁇ (3.14) or - ⁇ (-3.14), in which case the compensation The actual phase difference value between the two antenna signals to be applied is determined as ⁇ k (d), which is a compensation desired phase difference value.
  • the adaptive cyclic delay value ⁇ cyc, n is a sampling number, it should be an integer.
  • ⁇ k (d) which is a compensation desired phase difference value, is an actual phase difference between two antenna signals to which compensation is to be applied.
  • the adaptive cyclic delay value ⁇ cyc, n may not be an integer.
  • the compensation desired phase difference value ⁇ k (d) is the adaptive cyclic delay value according to Equation 1. It is desirable that the value of ( ⁇ cyc, n ) be an integer and determined as an approximation closest to the actual phase difference value between the two antenna signals to which the actual compensation will be applied.
  • the feedback information processor generates and transmits a feedback signal including the calculated adaptive cyclic delay value and the selected delay target antenna information to the transmitter, and the cyclic delay controller 350 of the transmitter according to FIG.
  • the delay target antenna transmits a signal (expressed by Equation 3 below) delayed by the adaptive cyclic delay value compared to the reference antenna signal.
  • the receiver in the present specification may be a terminal (UE), and as described above, such a UE is a comprehensive concept of a user terminal in wireless communication, and the UE (User Equipment) in WCDMA, LTE, HSPA, etc. It should be interpreted as a concept that includes a mobile station (MS), a user terminal (UT), a subscriber station (SS), and a wireless device in GSM.
  • MS mobile station
  • UT user terminal
  • SS subscriber station
  • GSM Global System for Mobile communications
  • FIG. 5 is a flowchart illustrating a method for compensating for frequency attenuation for a specific frequency band using a multiplex transmission antenna system according to an embodiment of the present invention
  • FIGS. 6 to 8 are examples of applying the embodiment of the present invention to a 3X1 multiple antenna system. Shows the change in the channel response characteristic.
  • the reception device calculates a phase difference between signals by estimating a reference signal transmitted from each antenna (S510). ), A specific frequency band searching step of searching for a specific frequency band capable of compensating for frequency attenuation through phase difference correction (S520), and a delayed target antenna for selecting a delay target antenna capable of compensating for frequency attenuation of a specific frequency band.
  • adaptive cyclic delay value calculation step S540 for calculating an adaptive cyclic delay value using the searched specific frequency band and the estimated reference signal, and the calculated adaptive cyclic delay value
  • a cyclic delay signal sending step (S560) for controlling to transmit a signal delayed by an adaptive cyclic delay value with respect to the delay target antenna using the annual value and the delay target antenna information.
  • the feedback information processing unit of the receiving apparatus may further include a correction check step (S570) for checking whether the correction for the frequency attenuation is performed by the S510 to S560, and if the channel correction is made, waiting for the next application period, the correction If this is not done properly, it may be configured to return to one of a specific frequency band search step (S520), a delay target antenna selection step (S530), and an adaptive cyclic delay value calculation step (S540).
  • S570 correction check step for checking whether the correction for the frequency attenuation is performed by the S510 to S560, and if the channel correction is made, waiting for the next application period, the correction If this is not done properly, it may be configured to return to one of a specific frequency band search step (S520), a delay target antenna selection step (S530), and an adaptive cyclic delay value calculation step (S540).
  • step to return to may be determined in consideration of the surrounding environment such as the moving speed of the terminal (receiving device), channel conditions, and other frequency distortion.
  • the feedback information processing unit 450 has a phase difference of ⁇ (3.14) or a signal transmitted from any two antennas in a specific frequency band search step (S520) and a delay target antenna selection step (S530).
  • ⁇ 3.14
  • FIG. 6 each channel response characteristic of antennas 1 to 3 is shown, and FIG. 7 shows a channel response characteristic of a receiver and a phase difference between antennas Ant1-Ant2 and Ant1-Ant3.
  • Figure is a diagram.
  • the frequency attenuation occurs severely in the vicinity of k of 385, and the phase differences (Ant1-Ant3) of antennas 1 and 3 are close to + ⁇ (3.14). Therefore, the feedback information processor of the receiver compensates for this band. It is determined as a specific frequency band that needs to be selected, and the antenna 3 that has generated such a phase difference with respect to the reference antenna is selected as the delay target antenna.
  • the feedback information processing unit of the receiving apparatus calculates the adaptive cyclic delay value according to Equation 1 previously mentioned in the adaptive cyclic delay value calculation step S540.
  • an index k indicating a specific frequency band requiring compensation is 385
  • a phase difference (compensation desired phase difference value) to be compensated for. this because it is almost ⁇ (3.14)
  • the final compensation desired phase difference value ⁇ k (d) becomes 3.16 (1.0078 ⁇ s).
  • the basic signal transmitted from the signal transmission device may be expressed by Equation 2 below.
  • the delayed signal delayed by the adaptive cyclic delay value ( ⁇ cyc, n ) according to the cyclic delay signal transmission step (S560) can be expressed as Equation 3 below.
  • Equations 2 and 3 S (l) and S (k) represent complex signals on the time axis and the frequency axis, respectively.
  • k and l are deulyigo index (index) of the time axis and frequency axis
  • n is number
  • k is the index of the delay target antenna
  • N FFT in a particular frequency band is the number of sub-carriers (sub-Carrier).
  • the receiving device receiving the signal delayed by the adaptive cyclic delay value as described above in ANT3 again checks the frequency response characteristics to check whether the correction for the frequency attenuation is properly performed (S570), and if the channel correction is made, waits for the next application period. If the correction is not performed properly, the specific frequency band search step (S520), the delay target antenna selection step (S530), taking into consideration the surrounding environment such as the moving speed, the channel condition, and other frequency distortion of the terminal (receiving device), It is preferable to return to one of the adaptive cyclic delay value calculation steps (S540).
  • the receiver can appropriately select a specific frequency band, which has not been available in the past, to compensate for the frequency attenuation, thereby improving frequency selectivity and channel response characteristics.
  • the adaptive cyclic delay value calculated by the above Equation 1 becomes large, and in this case, By functioning similarly to a large delay CDD, there is a possibility that the frequency attenuation compensation according to one embodiment of the present invention may not be performed in a sufficient band.
  • a precoding scheme may be additionally applied to a frequency band having a low specific frequency band.
  • the low frequency band is pre-coding is applied is specifically, k is N FFT / 4 or less means the extent of the band, but not limited to this, the frequency at which the number and compensation of the pole (Pole) generated by the cyclic delay application required Other values may be determined according to the size of the band.
  • the transmitting device may further perform a precoding step of multiplying the initial transmission signal by a specific precoding matrix, and this precoding step may be performed before the cyclic delay signal transmission step. It is preferred to be performed, but not limited to.
  • the precoding technique is a technique for increasing the transmission reliability of data in a multi-antenna OFDM system, and is used to maximize the signal-to-noise ratio through the corresponding feedback information in a closed loop system that can use the feedback information at the transmitter.
  • a codebook-based precoding scheme may be used, and a method of obtaining a signal-to-noise ratio (SNR) gain by feeding back an index of a precoding matrix already known by a transceiver to a transmitter, according to an embodiment of the present invention.
  • SNR signal-to-noise ratio
  • the receiver feeds back an optimal precoding matrix index to the transmitter using channel information among common precoding matrices held by the transceiver, and the transmitter corresponds to the fed back index. Apply the precoding matrix to the transmitted signal.
  • precoding by a closed loop may not be used. If the transmitter already knows an optimal precoding matrix for a specific or full frequency band, the above-described precoding function may be performed without feedback information.
  • the desired gain improvement is obtained using the precoding technique in the low frequency band, and by using the adaptive cyclic delay scheme according to the embodiment of the present invention. By compensating for the frequency attenuation, it is possible to improve the frequency selectivity of the entire frequency band.
  • the case of the 3 X 1 multi-antenna system is taken as an example, but may be applied to the NXM multi-antenna system.
  • the antenna 3 is applied as an adaptive cyclic delay according to an embodiment of the present invention. However, it may be applied to other additional antennas or a plurality of antennas simultaneously or sequentially.
  • the present invention is not limited to the wireless communication field of the 3GPP series, and is required to increase frequency selectivity over the entire channel and improve response characteristics in a specific frequency band in other current communication fields or future multi-antenna systems. It may be used in the field.
  • a frequency band to which frequency resources are to be allocated is compared with a large delay CDD (Large Delay CDD) scheme which increases the frequency selectivity across the channel to obtain the gain of channel coding.
  • CDD Large Delay CDD
  • the channel response can be improved by compensating for the phase difference by adjusting the cyclic delay of the signal received by the antenna.
  • the frequency resource can be allocated to the band. Is better than the way.
  • the feedback signal fed back from the receiving device to the transmitting device needs to include only the information indicating the antenna to be delayed and the adaptive CDD delay value
  • general codebook or channel information having different amounts of information is described in detail.
  • an antenna to which a cyclic delay is applied is selected on the receiving side based on a phase difference of a transmission signal of a plurality of transmitting antennas, and an optimized adaptive cyclic delay value is calculated and provided to the transmitting side.
  • the transmitting side is a very useful invention that can improve the frequency utilization efficiency by compensating for the frequency attenuation in a desired frequency band by performing a cyclic delay transmission based on the transmission side.

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PCT/KR2010/004123 2009-06-24 2010-06-24 적응형 순환 지연 다이버서티를 이용한 주파수 감쇄 보상 방법 및 그를 이용한 송신장치와 방법, 수신장치와 방법 WO2010151068A2 (ko)

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Application Number Priority Date Filing Date Title
JP2012517389A JP2012531801A (ja) 2009-06-24 2010-06-24 適応型巡回遅延ダイバーシティを用いた周波数減衰の補償方法並びにそれを用いた送信装置と送信方法及び受信装置と受信方法
US13/380,451 US20120093258A1 (en) 2009-06-24 2010-06-24 Method for compensating for frequency attenuation using adaptive cyclic delay diversity, and transmitting apparatus and method and receiving apparatus and method using same
EP10792350A EP2448141A2 (en) 2009-06-24 2010-06-24 Method for compensating for frequency attenuation using adaptive cyclic delay diversity, and transmitting apparatus and method and receiving apparatus and method using same
CN2010800360774A CN102484516A (zh) 2009-06-24 2010-06-24 利用自适应循环延迟分集来补偿频率衰减的方法以及使用该方法的发射装置及方法和接收装置及方法

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KR1020090056710A KR20100138264A (ko) 2009-06-24 2009-06-24 적응형 순환 지연 다이버서티를 이용한 주파수 감쇄 보상 방법 및 그를 이용한 송신장치와 방법, 수신장치와 방법
KR10-2009-0056710 2009-06-24

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